Date   

Re: Tinker Board Direct Sampling server

Jeff Kelly
 

Since I am running a  rtl-sdr dongle with only 2M width on my Tinker Board,

I decided to automate changing the bands that I listen to throughout the day.

Basically , by restarting spyserver with a different config file after a pre-determined delay.

So the first effort is a simple script that will loop. 

Next, I will move this to a cron to be more accurate.

Jeff (linux hack!)

#!/bin/bash
cd /home/linaro/spyserver
lxterminal -e "/home/linaro/spyserver/spyserver" "spyserver_20M.config"
sleep 180m
pkill spyserver
lxterminal -e "/home/linaro/spyserver/spyserver" "spyserver_40M.config"
sleep 240m
pkill spyserver
lxterminal -e "/home/linaro/spyserver/spyserver" "spyserver_75M.config"
sleep 240m
pkill spyserver
lxterminal -e "/home/linaro/spyserver/spyserver" "spyserver_BC.config"
sleep 300m
pkill spyserver
lxterminal -e "/home/linaro/spyserver/spyserver" "spyserver_40M.config"
sleep 480m
pkill spyserver
cd /home/linaro/
sh ./job.sh


On 11/14/2017 10:24 AM, Jeff Kelly wrote:

TY!

Jeff


On 11/14/2017 10:22 AM, prog wrote:
On Tue, Nov 14, 2017 at 07:17 am, Jeff Kelly wrote:

allow control 0 and HTOP:

Jeff

Every user session will take 12 ~ 13 % of one core. The FFT takes half a core, but only done once for all users, plus something for the OS and other processes.
This means you can probably stuff 20 users in that RPi (other memory bandwidth/bus limits will be reached before the CPU is fully utilized). This needs some testing.



Re: New SpyServer optimizations and features #spyserver

Jeff Kelly
 

Martin,


Lots of stutter in New Jersey.


Jeff


On 11/14/2017 2:50 PM, Martin via Groups.Io wrote:
Hi Jon,

Try my V3 running in direct sampling mode with no filters.

sdr://g8jnj.zapto.org:5557

Regards,

Martin - G8JNJ


Re: New SpyServer optimizations and features #spyserver

Martin - G8JNJ
 

Hi Jon,

Try my V3 running in direct sampling mode with no filters.

sdr://g8jnj.zapto.org:5557

Regards,

Martin - G8JNJ


Re: New SpyServer optimizations and features #spyserver

Martin - G8JNJ
 
Edited

Hi Jon,

The Wellbrook tends to have a high output on the lower frequencies.

You could try adding something like a 100pF capacitor in series with the RF feed to the RTL-SDR as a very crude amplitude equaliser.

This will roll off the gain at 2MHz by about 20dB and 1dB at 30MHz but will still be OK for MF reception as the natural noise floor tends to dominate on the lower frequencies. If the attenuation is to much try a slightly larger value of capacitor until you find a happy compromise.

Here's a link to an online attenuator calculator.

https://www.everythingrf.com/rf-calculators/attenuator-calculator

Regards,

Martin - G8JNJ


Re: Good CAT and/or Omnirig Plugin?

 

There is a CAT plugin for Sdr#, its called sdrsharp-catcontroller
Its been a while, the but when I did try it previously, it worked very well. Presents sdrsharp as a TS50
Find it on Google and/or gitHub

73 de kc1ccr
bammi


Re: Airspy HF+ available at Wimo #airspyhfplus

G5VU
 

My experience with previous Airspy purchases from Itead has taught me that it's very well worth taking the gamble regarding any import duty and VAT etc
At the moment I'm winning 2-0

73s Tracey G5VU

----- Original Message -----
From: Alan G4ZFQ <alan4alan@gmail.com>
Reply-To: <main@airspy.groups.io>
To: <main@airspy.groups.io>
Sent: 14-Nov-17 5:22:25 PM
Subject: Re: [airspy] Airspy HF+ available at Wimo #airspyhfplus
________________________________________________________________________________

For the UK, the Wimo price of 232 Euros equates to roughly £209 plus
shipping, without any shipping.
Tracey,

Which includes tax. Around £33 VAT.

I missed out on the discount voucher but still only paid £161 inc
shipping from Itead.
Which does not, best of luck!

73 Alan G4ZFQ

So there is a fairly hefty mark up of over 25% if we use the main source
for Airspy products in Europe.
I'm not complaining, just commenting on the situation.


Re: New SpyServer optimizations and features #spyserver

Jon Fear
 

Wow! Still won't be long and then the Wellbrook will be put to good use....

1623 installed and running, just a few tests now.

Thanks for everything Youssef.


Re: New SpyServer optimizations and features #spyserver

prog
 

On Tue, Nov 14, 2017 at 09:55 am, Jon Fear wrote:
..And there was I thinking all was good on 1622! Downloading 1623 now...

As for an attenuator, oops, not got one....Time for some more home brew building. Anyone got any good designs that I can knock up? 

Still the HF+ will be here soon...

VHF from Weston super Mare will be online later (87.50MHz through 150MHz).

BW

Jon
Here's the funny part: https://twitter.com/lambdaprog/status/930489661063036931


Re: New server West of Scotland - Is it working?

claudio36itus
 

Hi John

are your server up and running? as I tried again but no signal on my remote airspy software 

73

Claudio 


Re: New SpyServer optimizations and features #spyserver

Jon Fear
 

...And there was I thinking all was good on 1622! Downloading 1623 now...

As for an attenuator, oops, not got one....Time for some more home brew building. Anyone got any good designs that I can knock up? 

Still the HF+ will be here soon...

VHF from Weston super Mare will be online later (87.50MHz through 150MHz).

BW

Jon


Re: Airspy HF+ available at Wimo #airspyhfplus

airspy@...
 

But if it goes wrong don't expect Moonraker to help you. Still there's always the R&D&manufacturing in China ;-(

For the sake of a few quid I'd sooner sleep at night and not be a skinflint. Yo ho ho

Dave GW4GTE
Not, fortunately, down to his last 50 quid


Re: Airspy HF+ available at Wimo #airspyhfplus

Keith
 

Yes but when customs get the incoming parcel they will add 5% duty to the HF+ price
and then 20% VAT to the total including the duty and shipping cost .....
So the actual price will be closer to $199 + 5% is $209 then $209 + $24 shipping (DHL to UK) + 20% is $280
which amounts to around 238 euro putting Wimo about the right mark for FULL price i.e. no discount coupons (however without shipping cost)
The biggest uplift comes from Moonraker as $280 (which includes shipping) equates to £213 but Moonraker's
standard price is £230 (without shipping).
It follows that buying direct from itead.cc looks at present the best deal for the UK.


Re: Airspy HF+ available at Wimo #airspyhfplus

Alan G4ZFQ
 

For the UK, the Wimo price of 232 Euros equates to roughly £209 plus shipping, without any shipping.
Tracey,

Which includes tax. Around £33 VAT.

I missed out on the discount voucher but still only paid £161 inc shipping from Itead.
Which does not, best of luck!

73 Alan G4ZFQ

So there is a fairly hefty mark up of over 25% if we use the main source for Airspy products in Europe.
I'm not complaining, just commenting on the situation.


Re: New SpyServer optimizations and features #spyserver

prog
 

On Tue, Nov 14, 2017 at 09:16 am, Martin wrote:
Hi Jon,

You can't adjust the gain in direct sampling mode.

The only fix is to put an attenuator between the antenna and Dongle.

Regards,

Martin - G8JNJ
Indeed. I rebuilt the server to disable the gain setting when in direct sampling mode. v2.0.1623.


Re: Airspy HF+ available at Wimo #airspyhfplus

prog
 

On Tue, Nov 14, 2017 at 09:16 am, Tracey Gardner wrote:
 
So there is a fairly hefty mark up of over 25% if we use the main source for Airspy products in Europe.
 
It's called VAT.


Re: Airspy HF+ available at Wimo #airspyhfplus

G5VU
 

 
 
For the UK, the Wimo price of 232 Euros equates to roughly £209 plus shipping, without any shipping.
I missed out on the discount voucher but still only paid £161 inc shipping from Itead.
So there is a fairly hefty mark up of over 25% if we use the main source for Airspy products in Europe.
 
I'm not complaining, just commenting on the situation.
 
Regards
 
Tracey G5VU
 
 
 

----- Original Message -----
From: prog <info@...>
Reply-To: <main@airspy.groups.io>
To: <main@airspy.groups.io>
Sent: 14-Nov-17 2:37:36 PM
Subject: [airspy] Airspy HF+ available at Wimo #airspyhfplus

Hi all,

Wimo just announced the availability of the Airspy HF+ at their web store and started accepting pre-orders at a very convenient launch price. This is your main source for Airspy products in EU.

https://www.wimo.com/airspy-hfplus-sdr-receiver_e.html

Thanks!


Re: New SpyServer optimizations and features #spyserver

Martin - G8JNJ
 

Hi Jon,

You can't adjust the gain in direct sampling mode.

The only fix is to put an attenuator between the antenna and Dongle.

Regards,

Martin - G8JNJ


Re: Good CAT and/or Omnirig Plugin?

Ruben Navarro Huedo (EA5BZ)
 

I know Adam...also SDR-Radio, but i like SDR# and i want try to use it for that purpose.


Re: Good CAT and/or Omnirig Plugin?

adam9a4qv
 

HDSDR support that already.

Adam


Re: Tinker Board Direct Sampling server

Jeff Kelly
 

Thank you Dick!  Plenty to learn.

Appreciate you sending the note.

Jeff



On 11/14/2017 10:02 AM, Dick wrote:
Hi Jeff,
 
Myabe uou already knew this but when running TOP press the “1” character (on the normal not numeric keyboard) and you will see the usage per CPU. More informative.
 
My guess is that spyserver is using only one of the n CPU’s.
 
Cheers,
Dick
 
From: Jeff Kelly
Sent: Tuesday, November 14, 2017 15:53
To: main@airspy.groups.io
Subject: Re: [airspy] Tinker Board Direct Sampling server
 
Any chance you can interpret this TOP grab?
I am worried about the %93.1 or happy about the 74.4 id?

Jeff


On 11/14/2017 9:39 AM, prog wrote:
On Tue, Nov 14, 2017 at 06:36 am, Jeff Kelly wrote:
I put a Tinker Board Direct Sampling server up this morning.
Works pretty good here!

sdr://k2sdr.dyndns.org:5557/

Jeff
K2SDR
Works wonderfully.


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